Originally Posted by
sleepinsol
a. chambered/baffled mufflers quiet hondas down. i had a thrush turbo muffler with chambers and baffles and NO pacikng, and all you heard from my setup was the engine. it sounded stock. i also had another one on my old setup and it too was quiet. straight thru ovals with no packing dont quiet anything down any mroe than a fart can will.
b. the only difference between 60mm piping and 2.5" piping is 1/8 an inch. THATS IT. that is not going to limit any future power gains. ive seen b series motors with 60mm exhausts make 200 + n/a all day long. if anything it may benifit the powerband of that b16 since the 1/8 of a inch smaller diameter will give a tiny extra amount of back pressure. but that will be minimal if anything. you wont see much a difference between 2.5" pipe and 60mm pipe. mandrel bends are a must tho to prevent bottle necks. if anything youll get the best gains from a good header and a test pipe/higher flowing cat.
ok it's an 1/8 of an inch so approximately 5mm? ok so when some one goes from a 60mm tb to a 65mm (approximately 2.5") throttle body are there no gains or minimal increase in flow? absolutely not, when you increase the diameter by 1/8 of an inch what you are increasing is the volume of your piping throughout the entire system not so much just the diameter in one area. so for an entire system it would equate to a lot less volume in the exhaust system. also, i wasnt saying to use a fart can, mufflers with a good packing material have a tendency to be quieter than those without. i'm not saying yours was not quiet, but for the most part if you buy a muffler (same style as the thrush) with ceramic/stainless packing it is usually a lot less. the dynomax ultraflo oval mufflers are usually pretty quiet and quite durable. it is definitely a much better built muffler than the thrush, hence, the reason it costs more. in addition to that the ultraflo flows a much higher cfm of air than the turbo style because of its internal straight through design. now don't take what im saying as offensive because im not saying that ur thrush is no good, but there are better mufflers out there that offer a much better sound and flow design than it, in my opinion of course. lol i didnt just post up here because i felt like talking, i have built a lot of exhaust systems, and i have actually used the thrush. i dont know what motor you had it on, what size piping you used, or if you had any other resonators (or cats) on there, but i have built a system with that muffler alone and it is not a pleasant sound. and as for those cars with the 60mm piping making 200+ all day, i'll bet they would make more power with a 2.5" system rather than the 60mm.